Jack



J. H. BURKHOLDER.

JACK.

APPLICATION FILED MAR. 10, 1919.

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JACK.

APPLICATION FILED MAR; 10, 1919.

1,335,479. Patented Mar. 30,1920.

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TNT ermin JOHN H. BURKHOLDER, OF ASHLAND, OHIO, ASSIGNOR T ELITE MANUFACTURING COMPANY, A PARTNERSHIP 0R FIRM GOMPQSED OF JOHN H. BURKHOLDER, P. E. COUNTRYMAN, AND E. L. KILHEFNER, OF A HLAND, OHIO.

JACK.

To all whom it may concern Be it known that 1, JOHN H. BURKHOLDER, citizen of the United States, residing at Ashland, in the county of Ashland and State of Ohio, have invented certain new and useful Improvements in Jacks, of which the following is a specification.

My invention relates to improvements in jacks, and the object of the invention is to provide a jack in which the direction of movement of the lift member is controlled by merely pushing or pulling upon the operating lever to shift the lever longitudinally in a limited degree. The conception involves the use of a ratchet wheel having teeth adapted to be engaged from opposite sides by separate pawls, whereby the wheel may be rotated in either direction dependent upon which pawl is placed in use. The setting of either pawl for independent use is obtained by shifting the lever longitudinally as stated and mounting the pawls upon the lever or a socket member for the lever. A further object is to provide a simple form of spring tension for the ratchet wheel to prevent loss of motion or a back movement in oscillatory movements of the lever, and a further object is in providing a simple form of snap lock for holding the lever in its shifted positions and to hold the working pawl in constant working on gagement with the ratchet teeth.

In the drawings forming part of this application, Figure 1 is a side view of my improved jack, showing the standard partly in section and the cover plate for the ratchet wheel omitted and with the lifting pawl in working engagement with the ratchet teeth. In this position of the lever the down stroke of the lever is the working stroke and the up stroke is idle. Fig. 2 is a rear view and vertical section centrally of the jack and with the lever and its socket member in section and raised to a vertical position. Fig. 3 is a side view of the upper end of the standard. with the pivot stud and ratchet wheel hub in cross section on line 3 3, Fig.

2 and showing the tension spring for the hub. Fig. 1 is a transverse section in plan on line 4: 1, Fig. 2, and Fig. 5 is a side view of the ratchet wheel and operating lever alone and with the lowering pawl engaged with the ratchet teeth, and showing that the up stroke of the lever is the work Specification of Letters latent. Patented lvlar. 30, 1926.

Application filed March 10, 1919.

Serial No. 281,581.

ing stroke and that the down stroke is idle. Fig. 6 is a side and sectional view showing a modified form of a cover or cap and a locking device and socket member for the operating lever, and Fig. 7 is a cross section taken on line 77, Fig. 6.

As delineated, the jack comprises a hollow standard 2 adapted to support a lift screw for vertical slidable movement therein, the screw having a cross pin 4 at its lower end extending into slots 5 in the sides of the standard to prevent the screw from turning and being further provided with a suitable rest member 6 pinned upon its upper end. This screw is raised or lowered by a combined nut and bevel gear 7 which is rotatably seated upon the top of the standard, and rotation of gear 7 is through a second larger bevel gear and ratchet wheel 8 which is mounted to rotate about a stud 9 projeotin laterally at one side of the standard. 10 adjacent the standard which is engaged by flat spring 11 hooked at its upper end to a pin 12 on the standard and bent around the hub and engaged over a second pin 1ft lower down upon the standard, and this spring has suficient tension and engages the hub frictionally so that wheel 8 will remain set and immovable during idle strokes of the operating lever 15.

Rotation of wheel 8 is obtained by oscillating the lever 15, and the direction of rotation ofthe wheel is dependent upon the position of two pawls 16 and 17 relatively to the internal ratchet teeth 18 within the wheel. To better distinguish these pawls, pawl 16 is termed the lifting pawl inasmuch as the only function of this pawl is to rotate the ratchet wheel to raise the lift screw 3 upon each down stroke of lever 15, and as more power is required to raise the lift screw than to lower it under load, the lift pawl. 16 is preferably pivoted upon the extremity of the lever socket member 19 so that said pawl will be raised by pressing down uponthe lever 15. The upward movement of the lever is idle when pawl 16 is in working engagement with the ratchet teeth 18, and this working position is maintained so long as socket member 19 is rotatahly engaged with the pivot screw 20 at the fulcrum notch 21 in said member. A fiat spring 22 with rounded ends is con- .as shown in Fig. 5.

fined in a slot 23 in said member 19 opposite said notch 21 and a second similar notch' 24: at one side thereof, and this single spring bears against one side of the pivot screw 20 and holds the socket member in rotatable engagement with the pin at either notch 21 or 241. Further, this spring permits said member to be shifted longitudinally by push or pull upon lever 15, inasmuch as the spring will. yield as the lever is shifted and the detent or raised portion 25 between .the two semi-circular notches is crowded over the pivot screw. This arrangement is in effect a snap look for the lever so that the lever may be held for long intervals in two different rotative positions'on the pivot screw, one to raise the lift screw and the other :to lower it.

A lowering movement of the lift screw 3 step by step, is obtained by setting pawl 17 in working engagement with the ratchet 18 and withholding pawl 16 from action. The change is brought about by simply pulling upon lever 15 and slnftmg the socket member 19 upon. the pivot screw 20 so that the lever may oscillate within or upon notch 21- Pawl 17 now engages the ratchet teeth onthe opposite side to that engaged by pawl 16 when acting to rotate the wheel in a reverse direction. The upward stroke of the operating lever 15 now becomes the working stroke and pawl 17 rides idly over the teeth on the down stroke. These parts remain inthis working position continuously during oscillatory movements of the lever, and the lever is only shifted longitudinally whenthe direction of movement of the ratchet wheel and the lift screw is to be reversed.

Pawls ,16and 17 have arms or extensions connected by a single coiled-spring 27, and

separate stop lugs 28 and 29 on the inside but" to make the device more compact for shipment, the lever is used as a handle and made a detachable part of member 19. User.

in this way, a fastening of some kind is necessary between said parts to permit pull and shift of member 19 without withdrawing2the lever from the socket end of said member. A simple hook orpivoted latch 28 orits equivalent may be used to fasten the lever and. socket member 19 together.

.In Fig. 2 'Ialso'show a plate .29 covering one-sideof the ratchet wheel and the work .ing parts, which plate is held in place by the head of the pivot screw; and in Figs. 6

and 7 I show a modification, comprising a. fiat disk 30 with a channeled offset extend ing across its diameter within which a movable support 31 for the pawls is adapted to slide within the limits defined by a short slot 32 in the plate and a pivot screw 33. Member 31 is provided with two notches 3 1 and S5 in one edge, and a ball 36 confined in an opening 37 in the offset wall of the cover plate is adapted to occupy either notch under the locking pressure of a fiat spring .38. This is merely another form of snap lift member is raised or lowered. accordingly.

2. A jack comprising a standard, a lift member mounted upon said standard, a gear and a ratchet wheel adapted to raise and lower said lift member, a longitudinallymovable lever and pawls pivoted thereon adapted to engage said ratchet wheel and reverse the direction of movement thereof.

In a jack, a standard having a ratche wheel mounted to rotate in reverse directions thereon, a lever mounted to oscillate at the side of said wheel and movable in a direction toward and away from the aXis of said wheel, two pawls pivoted upon said lever adapted to rot-ate said wheel in op posite directions, and means to maintain one or the other or" said pawls in constant working engagement with said wheel during 0scillatory movements of said lever.

4. In a jack, a lift member and ratchet mechanism adapted to raise and lower said member, comprising a ratchet wheel and a lever mounted to slide and oscillate at the side of said wheel andhaving separate pawls thereon adapted to actuate said wheel in reverse directions and means adapted to lock said lever in different oscillatory positions relatively to said wheel.

5. In a jack, a lift member, and ratchet mechanism adapted to raise and lower said member, comprising a set of pawls for ,obtaining reverse ratchet movements, an oscillatory support for said pawls adapted to be shiftedon a fulcrum, and yielding-1001c ing means adapted to hold said support in its shifted positions during oscillatory movements thereof.

6. A jack comprising a standard, a lift screw and nut having a gear mounted upon said standard, a gear and ratchet wheel secured at the side or said standard, a slidable and oscillatory member mounted at the side of said wheel and having pawls adapted to be shifted into independent working engagement with said ratchet Wheel, and an operating handle and snap lock adapted to the oscillatory working positions of said member and its pawls.

7. A jack comprising a standard, a lift screw, a combined nut and gear sleeved upon said screw in rest position upon the top of said standard, a ratchet wheel at the side or said standard having a gear adapted to mesh with said combined nut and gear, a pair of pawls arranged to rotate said ratchet wheel in reverse directions, a slidable and oscillatory support for said pawls having an operating extension, and means adapted to lock said support and its pawls in two different oscillatory positions relatively to said ratchet wheel.

8. In a'jaclr, a lift member and means adapted to raise and lower said lift member comprising a ratchet wheel having a hub and a friction spring in bearing engagement with the sit e of said hub.

9. In a ack, a standard and lift screw, a nut and gear and a ratchet gear wheel mounted on said standard, and a flat bow spring secured at the side of said standard and frictionally engaged with said wheel.

10. In a jack, a lift member and mechanism adapted to raise and lower said member comprising a ratchet wheel and a pair of pawls and a slidable oscillatory support for said pawls having a pair of notches, and spring pressed means adapted to occupy said notches alternatively to fix the oscillatory working position of said support.

11. In a jack, a lift member and ratchet mechanism adapted to raise and lower said member comprising a ratchet wheel, an oscillatory member-slidably mounted at the side of said wheel, a pair of pawls pivoted 12. In a jack, a lift member having ratchet mechanism adapted to raise and lower the same, comprising an oscillatory and longitudinally-movable socket member for a lever, in combination with a lever and a locking device therefor comprising a hook on one of said parts and a projection on the other part adapted to secure the lever removably within the socket portion of said member. V

13. In a jack, a lift member and ratchet mechanism adapted to operate said member comprising a ratchet wheel, a pair of pawls and a support therefor, a pivot member for said support, said support having adjacent notches adapted to seat said pivot member, and a spring opposite said notches and engaging said pivot member.

14. In a jack, a lift member and a supporting standard therefor having a lateral stud, a combined nut and gear adapted to operate said lift member, a ratchet wheel and gear mounted to rotate upon said stud, a pair of pawls having a shifting oscillatory supporting member mounted at the sideof said wheel, a cover plate for said pawls and oscillatory member, a pivot screw adapted to hold said plate and oscillatory member jointly upon said stud, and an operating lever for said oscillatory member.

Signed at Ashland, in the county of Ashland. and State 01:" Ohio, this 4 day of March, 1919.

JOHN H. BURKHOLDER. 

